$$3a2-2ab-ab+3ab-5$$
$3a_{2}-5$
$$3a_{2}-3ab+3ab-5$$
$$3a_{2}-5$$
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$3$
$$\frac{\mathrm{d}}{\mathrm{d}a_{2}}(3a_{2}-3ab+3ab-5)$$
$$\frac{\mathrm{d}}{\mathrm{d}a_{2}}(3a_{2}-5)$$
$$3a_{2}^{1-1}$$
$$3a_{2}^{0}$$
$$3\times 1$$
$$3$$
